RT-SVX31A-EN36
Monthly Maintenance
Before completing the following
checks, turn the unit OFF and lock the
main power disconnect switch open.
HAZARDOUS VOLTAGE!
DISCONNECT ALL ELECTRIC
POWER INCLUDING REMOTE DIS-
CONNECTS BEFORE SERVICING.
Failure to disconnect power before
servicing can cause severe personal
injury or death.
Filters
[ ] Inspect the return air filters. Clean or
replace them if necessary. Refer to
the unit Service Facts for filter infor-
mation.
Cooling Season
[ ] Check the unit’s drain pans and con-
densate piping to ensure that there
are no blockages.
[ ] Inspect the evaporator and con-
denser coils for dirt, bent fins, etc. If
the coils appear dirty, clean them
according to the instructions de-
scribed in “Coil Cleaning” later in
this section.
[ ] Manually rotate the condenser fan(s)
to ensure free movement and check
motor bearings for wear. Verify that
all of the fan mounting hardware is
tight.
[ ] Inspect the F/A-R/A damper hinges
and pins to ensure that all moving
parts are securely mounted. Keep
the blades clean as necessary.
[ ] Verify that all damper linkages move
freely; lubricate with white grease, if
necessary.
[ ] Check supply fan motor bearings; re-
pair or replace the motor as neces-
sary.
Maintenance
[ ] Check the fan shaft bearings for
wear. Replace the bearings as nec-
essary.
[ ] Check the supply fan belt. If the belt
is frayed or worn, replace it. Refer to
the “Fan Belt Adjustment” section for
belt replacement and adjustments.
[ ] Verify that all wire terminal connec-
tions are tight.
[ ] Remove any corrosion present on
the exterior surfaces of the unit and
repaint these areas.
[ ] Generally inspect the unit for unusual
conditions (e.g., loose access pan-
els, leaking piping connections, etc.)
[ ] Make sure that all retaining screws
are reinstalled in the unit access
panels once these checks are com-
plete.
[ ] With the unit running, check and
record the: ambient temperature;
compressor suction and discharge
pressures (each circuit); superheat
(each circuit);
Record this data on an “operator’s
maintenance log” like the one shown in
Table 8. If the operating pressures indi-
cate a refrigerant shortage, measure
the system superheat. For guidelines,
refer to the “Compressor Start-Up” sec-
tion.
Note:
Do Not release refrigerant to the
atmosphere! If adding or removing
refrigerant is required, the service
technician must comply with all federal,
state and local laws.
Heating Season
[ ] Inspect the unit’s air filters. If neces-
sary, clean or replace them.
[ ] Check supply fan motor bearings; re-
pair or replace the motor as neces-
sary.
[ ] Inspect both the main unit control
panel and heat section control box
for loose electrical components and
terminal connections, as well as
damaged wire insulation. Make any
necessary repairs.
[ ] Clean burner area, verify gas heat
system operates properly.
Coil Cleaning
Regular coil maintenance, including
annual cleaning, enhances the unit’s
operating efficiency by minimizing:
compressor head pressure and am-
perage draw; evaporator water
carryover; fan brake horsepower, due
to increase static pressure losses; air-
flow reduction.
At least once each year, or more often
if the unit is located in a “dirty” environ-
ment, clean the evaporator and con-
denser coils using the instructions
outlined below. Be sure to follow these
instructions as closely as possible to
avoid damaging the coils.
To clean refrigerant coils, use a soft
brush and a sprayer (either a garden
pump-up type or a high-pressure
sprayer). A high-quality detergent is
also required; suggested brands in-
clude “SPREX A.C.”, “OAKITE 161”,
“OAKITE 166” and “COILOX”. If the de-
tergent selected is strongly alkaline
(ph value exceeds 8.5), add an inhibi-
tor.
1. Remove enough panels from the
unit to gain access to the coil.
2. Protect all electrical devices such as
motors and controllers from any
over spray.
3. Straighten any bent coil fins with a
fin comb.
4. Mix the detergent with water accord-
ing to the manufacturer’s instruc-
tions. If desired, heat the solution to
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